let see, this is what I did to my EX

1/. My cousin's Shop's back yard - same 5th Gen Catalytic Converter.

2/. Poke through it and removed all the "stuff" inside => free High Flow Cat. - FREE

3/. Replace it over my current one + HKS Dragger Muffler ($155 - 20% discounted off Nopi's WHOLESALE) + Custom Mendrel 2.5 Pipe Bending of the Rear end ($45)=>perfect High flow Cat back system: Enough Back Pressure => max increase in HP.

4/. Emission Check? plug my old Cat Converter back on

TOTAL = $200